mirror of
https://github.com/gcc-mirror/gcc.git
synced 2026-05-06 14:59:39 +02:00
b376b1ef38
This removes the helper functions added by r8-1294 to detect whether the char_traits member functions can be evaluated at compile time. Instead, we can just use __builtin_constant_evaluated directly, which is well supported by non-GCC compilers by now. As a result, there is a chance that those members will no longer be usable in constant expressions when using old versions of non-GCC compilers. Make the relevant feature test macros depend on the availability of __builtin_constant_evaluated, so they are defined only when the feature is actualyl available. The new testcase from the PR is added to the libitm testsuite, because that's where we can be sure it's OK to use the -fgnu-tm option. Signed-off-by: Jonathan Wakely <jwakely@redhat.com> PR libstdc++/91488 libstdc++-v3/ChangeLog: * include/bits/basic_string.h (__cpp_lib_constexpr_string): Only define when is_constant_evaluated is available. * include/bits/char_traits.h (__cpp_lib_constexpr_char_traits): Likewise. (__constant_string_p, __constant_array_p): Remove. (char_traits): Use is_constant_evaluated directly. * include/std/version (__cpp_lib_constexpr_char_traits) (__cpp_lib_constexpr_string): Only define when is_constant_evaluated is available. libitm/ChangeLog: * testsuite/libitm.c++/libstdc++-pr91488.C: New test.
This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the files whose names start with COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs/ for how to report bugs usefully. Copyright years on GCC source files may be listed using range notation, e.g., 1987-2012, indicating that every year in the range, inclusive, is a copyrightable year that could otherwise be listed individually.